Synorthocladius

Liu, Yuedan & Wang, Xinhua, 2005, Synorthocladius Thienemann from China, with a review of the genus (Diptera: Chironomidae: Orthocladiinae), Zootaxa 1057, pp. 51-60 : 58

Key to males of the genus Synorthocladius of the world*

1. Acrostichals absent; antepronotum without lateral setae .............................................. 2

– Acrostichals hooked; antepronotum with lateral setae.................................................. 3

2. Anal point narrow and with pointed apex, with 3­4 setae at base; inferior volsella finger shaped. ( Mongolia) ............................................ S. mongolwexeus (Sasa & Suzuki)

– Apex of anal point rounded, with 6 setae at base; inferior volsella broader and rectangular. ( Japan) ................................................................................. S. tamaparvulus Sasa

3. Pseudospurs present on tarsomeres I and II of middle and hind legs; anal point nearly equilateral triangular; inferior volsella broader; Cu1 nearly straight. ( Japan) ................ ........................................................................... S . asamasecundus Sasa & Hirabayashi

– Pseudospurs absent; anal point narrow and apically pointed; inferior volsella narrower; Cu1 slightly curved and end of Cu1 slightly recurved ........................................ 4

4. Tentorium not bifurcate, with small mediolateral tubercle; inferior volsella bent and apically triangular; scutal stripes light brown. (Europe, Asia, and North America)....... ..................................................................................................... S. semivirens (Kieffer)

– Tentorium bifurcate; inferior volsella apically rounded, finger shaped; scutal stripes dark brown. (Oriental China) .................................................................. S. bifidus sp. n.